.TH std::iswctype 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::iswctype \- std::iswctype

.SH Synopsis
   Defined in header <cwctype>
   int iswctype( std::wint_t wc, std::wctype_t desc );

   Classifies the wide character wc using the current C locale's LC_CTYPE category
   identified by desc.

   If the value of wc is neither representable as a wchar_t nor equal to the value of
   the macro WEOF, the behavior is undefined.

.SH Parameters

   wc   - the wide character to classify
   desc - the LC_CTYPE category, obtained from a call to std::wctype

.SH Return value

   Non-zero if the character wc has the property identified by desc in LC_CTYPE facet
   of the current C locale, zero otherwise.

.SH Example


// Run this code

 #include <clocale>
 #include <cwctype>
 #include <iostream>

 bool classify(wchar_t wc, const std::string& cat)
 {
     return std::iswctype(wc, std::wctype(cat.c_str()));
 }

 int main()
 {
     std::setlocale(LC_ALL, "ja_JP.UTF-8");
     std::cout << "The character \\u6c34 is...\\n";
     for (std::string s : {"digit", "alpha", "space", "cntrl", "jkanji"})
         std::cout << s << "? " << std::boolalpha << classify(L'\\u6c34', s) << '\\n';
 }

.SH Output:

 The character 水 is...
 digit? false
 alpha? true
 space? false
 cntrl? false
 jkanji? true

.SH See also

   wctype looks up a character classification category in the current C locale
          \fI(function)\fP
   C documentation for
   iswctype
